This is an application for android smartphones and tablets i created, in which you enter the desired dimensions of the aquarium you plan to build and the app instantly calculates the aquarium volume, weight (empty & full of water) and the total surface area of glass needed!
The most important feature of the app, is that it also calculates the glass thickness we need and the exact glass pieces' dimensions we have to use. (The calculations use safety factor 3.8, which is the most common setting)
I believe it is a really handy app for aquarium designing/building, but also for analysing an existing aquarium!

All calculations are available in both metric (cm, ltres, m², kg etc) and imperial (inches, gallons, ft², lbs etc) units!